/Engine/Source/Runtime/Slate/Public/Widgets/Views/STreeView.h
Deprecated* SetItemsSource is deprecated. You probably want to use SetTreeItemsSource.
void SetItemsSource ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)<::[UE::Slate::Containers::TObservableArray](API\Runtime\SlateCore\Containers\TObservableArray)< ItemType >> InListItemsSource )